Furious about doctor providing water (8)
I believe the answer is:
irrigate
'water' is the definition.
(I know that water can be written as irrigate)
'furious about doctor' is the wordplay.
'furious' becomes 'irate' (I've seen this in another clue).
'about' means one lot of letters goes inside another.
'doctor' becomes 'rig' (both can mean to forge or manipulate).
'irate' placed around 'rig' is 'IRRIGATE'.
'providing' acts as a link.
(Other definitions for irrigate that I've seen before include "Water land to stimulate growth" , "Provide water artificially" , "Supply water to fields etc" , "Water land to increase its fertility" , "Pour water on" .)